شرکت در آزمون آنلاین زبان انگلیسی 1 - زبان انگلیسی 1 | آزمون شماره 13179

Is there somewhere I can . . . my clothes? 

Until a couple of years ago, Mars has always been the top candidate for a planet other than Earth where life might be found. What if Mars disappoints us? Are there other candidates in the Solar System?

The answer is yes, and the next-best shot at finding extra-terrestrial life forms is on Europa, a moon of the planet Jupiter. Right now, there is no other body in the solar system that attracts as much scientific attention as this bright strange-looking moon, the smallest of Jupiter’s four large satellites. These satellites (as you would approach them moving outward form Jupiter) are Io, Europa, Ganymede and Callisto.

Europa seems like a good bet. Life might be a bit strange, but perhaps not a lot stranger than the life forms recently found around hot vents in the abyssal ocean. Liquid water and sources of energy are the essential prerequisites for life. Europa might well have them. Strong tidal heat could keep the inside of Europa warm enough to have liquid water beneath a layer of ice. Therefore, any organic compounds would be mobile, in water. They could interact.

Which of the following questions is the one which the passage is mainly concerned with?